An analytically solvable mathematical model is presented to estimate heat transfer quantities in the film boiling region of metal quenched with water sprays. The model is based on the hydrodynamics of a single droplet which is separated from the metal by a vapor film. The temperature profile within the droplet is calculated as a semi-infinite body because of the short contact time. It is validated with our own experimental results and those from literature. The influence of droplet size and velocity, spray flux, surface temperature, and the salinity level are discussed. The heat transfer in the whole boiling regime was measured for metal sheets made of inconel, nicrofer, nickel, aluminum alloy and copper. The sheets, with a size of 200 mm × 200 mm and a thickness from 2 to 4 mm, are heated above Leidenfrost temperature to study the influence of various quenching parameters.
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.